US2639766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closure structure
Assignee: Individual
•
Filing: 1947-05-13
•
Granted: 1953-05-26
•
Expires: 1967-05-13
Abstract
No abstract record available.
Inventors
- 👤 Raymond C Pratt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:27
CPC Classifications
E; E06; E06B; E06B9/00; E06B9/24; E06B9/26; E06B9/28; E06B9/30; E06B9/32; E06B9/327
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US279835A
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USRE21518E
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US1013417A
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US1787158A
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US2128163A
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US1914050A
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US2212718A
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US2059134A
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US2090145A
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US2164556A
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US2229221A
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US2209276A
Cited
US2187242A
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US2248775A
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US2268858A
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US2255311A
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US2428197A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |